1 // Concept-checking control -*- C++ -*- 2 3 // Copyright (C) 2001, 2009 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file concept_check.h 26 * This is an internal header file, included by other library headers. 27 * You should not attempt to use it directly. 28 */ 29 30 #ifndef _CONCEPT_CHECK_H 31 #define _CONCEPT_CHECK_H 1 32 33 #pragma GCC system_header 34 35 #include <bits/c++config.h> 36 37 // All places in libstdc++-v3 where these are used, or /might/ be used, or 38 // don't need to be used, or perhaps /should/ be used, are commented with 39 // "concept requirements" (and maybe some more text). So grep like crazy 40 // if you're looking for additional places to use these. 41 42 // Concept-checking code is off by default unless users turn it on via 43 // configure options or editing c++config.h. 44 45 #ifndef _GLIBCXX_CONCEPT_CHECKS 46 47 #define __glibcxx_function_requires(...) 48 #define __glibcxx_class_requires(_a,_b) 49 #define __glibcxx_class_requires2(_a,_b,_c) 50 #define __glibcxx_class_requires3(_a,_b,_c,_d) 51 #define __glibcxx_class_requires4(_a,_b,_c,_d,_e) 52 53 #else // the checks are on 54 55 #include <bits/boost_concept_check.h> 56 57 // Note that the obvious and elegant approach of 58 // 59 //#define glibcxx_function_requires(C) boost::function_requires< boost::C >() 60 // 61 // won't work due to concept templates with more than one parameter, e.g., 62 // BinaryPredicateConcept. The preprocessor tries to split things up on 63 // the commas in the template argument list. We can't use an inner pair of 64 // parenthesis to hide the commas, because "boost::(Temp<Foo,Bar>)" isn't 65 // a valid instantiation pattern. Thus, we steal a feature from C99. 66 67 #define __glibcxx_function_requires(...) \ 68 __gnu_cxx::__function_requires< __gnu_cxx::__VA_ARGS__ >(); 69 #define __glibcxx_class_requires(_a,_C) \ 70 _GLIBCXX_CLASS_REQUIRES(_a, __gnu_cxx, _C); 71 #define __glibcxx_class_requires2(_a,_b,_C) \ 72 _GLIBCXX_CLASS_REQUIRES2(_a, _b, __gnu_cxx, _C); 73 #define __glibcxx_class_requires3(_a,_b,_c,_C) \ 74 _GLIBCXX_CLASS_REQUIRES3(_a, _b, _c, __gnu_cxx, _C); 75 #define __glibcxx_class_requires4(_a,_b,_c,_d,_C) \ 76 _GLIBCXX_CLASS_REQUIRES4(_a, _b, _c, _d, __gnu_cxx, _C); 77 78 #endif // enable/disable 79 80 #endif // _GLIBCXX_CONCEPT_CHECK 81
